I highly recommend the 'Lip Sleeping Mask' that completely cured my habit of picking at my lips.

I have a bad habit of biting off the dead skin on my lips with my teeth 365 days a year. It used to be stressful because my lips would bleed all the time and lipstick would clump terribly. But thanks to a friend's recommendation, I bought a Lip Sleeping Mask at Olive Young and started applying a huge amount before bed. The next morning, when I gently rub my lips while washing my face, the old dead skin flakes off like dirt! Haha. My lips have become so plump, like a baby's bottom, that I really enjoy applying lipstick these days. If you pick at your lips like me, you absolutely have to buy this!